/***************************************************************************

	Atari Major Havoc hardware

	driver by Mike Appolo

	Games supported:
		* Alpha One
		* Major Havoc
		* Major Havoc: Return to Vax

	Known bugs:
		* none at this time

****************************************************************************

	MAJOR HAVOC (Driver)

	Notes:

	This game was provided in three configurations:
	1) New Machine Purchase
	2) Upgrade kit for Tempest (Kit "A")
	3) Upgrade kit for Space Duel, Gravitar, and Black Window (Kit "B")

	Controls on the machine were:
	A backlit cylinder (roller) on new Major Havoc machines
			or
	A Tempest-like spinner on upgrades


	Memory Map for Major Havoc

	Alpha Processor
	                 D  D  D  D  D  D  D  D
	Hex Address      7  6  5  4  3  2  1  0                    Function
	--------------------------------------------------------------------------------
	0000-01FF     |  D  D  D  D  D  D  D  D   | R/W  | Program RAM (1/2K)
	0200-07FF     |  D  D  D  D  D  D  D  D   | R/W  | Paged Program RAM (3K)
	0800-09FF     |  D  D  D  D  D  D  D  D   | R/W  | Program RAM (1/2K)
	              |                           |      |
	1000	      |  D  D  D  D  D  D  D  D   |  R   | Gamma Commuication Read Port
	              |                           |      |
	1200          |  D                        |  R   | Right Coin (Player 1=0)
	1200	      |     D                     |  R   | Left Coin  (Player 1=0)
	1200          |        D                  |  R   | Aux. Coin  (Player 1=0)
	1200          |           D               |  R   | Diagnostic Step
	1200          |  D                        |  R   | Self Test Switch (Player 1=1)
	1200          |     D                     |  R   | Cabinet Switch (Player 1=1)
	1200          |        D                  |  R   | Aux. Coin Switch (Player 1=1)
	1200          |           D               |  R   | Diagnostic Step
	1200          |              D            |  R   | Gammma Rcvd Flag
	1200          |                 D         |  R   | Gamma Xmtd Flag
	1200          |                    D      |  R   | 2.4 KHz
	1200          |                       D   |  R   | Vector Generator Halt Flag
	              |                           |      |
	1400-141F     |              D  D  D  D   |  W   | ColorRAM
	              |                           |      |
	1600          |  D                        |  W   | Invert X
	1600          |     D                     |  W   | Invert Y
	1600          |        D                  |  W   | Player 1
	1600          |           D               |  W   | Not Used
	1600          |              D            |  W   | Gamma Proc. Reset
	1600          |                 D         |  W   | Beta Proc. Reset
	1600          |                    D      |  W   | Not Used
	1600          |                       D   |  W   | Roller Controller Light
	              |                           |      |
	1640          |                           |  W   | Vector Generator Go
	1680          |                           |  W   | Watchdog Clear
	16C0          |                           |  W   | Vector Generator Reset
	              |                           |      |
	1700          |                           |  W   | IRQ Acknowledge
	1740          |                    D  D   |  W   | Program ROM Page Select
	1780          |                       D   |  W   | Program RAM Page Select
	17C0          |  D  D  D  D  D  D  D  D   |  W   | Gamma Comm. Write Port
	              |                           |      |
	1800-1FFF     |  D  D  D  D  D  D  D  D   | R/W  | Shared Beta RAM(not used)
	              |                           |      |
	2000-3FFF     |  D  D  D  D  D  D  D  D   |  R   | Paged Program ROM (32K)
	4000-4FFF     |  D  D  D  D  D  D  D  D   | R/W  | Vector Generator RAM (4K)
	5000-5FFF     |  D  D  D  D  D  D  D  D   |  R   | Vector Generator ROM (4K)
	6000-7FFF     |  D  D  D  D  D  D  D  D   |  R   | Paged Vector ROM (32K)
	8000-FFFF     |  D  D  D  D  D  D  D  D   |  R   | Program ROM (32K)
	-------------------------------------------------------------------------------

	Gamma Processor

	                 D  D  D  D  D  D  D  D
	Hex Address      7  6  5  4  3  2  1  0                    Function
	--------------------------------------------------------------------------------
	0000-07FF     |  D  D  D  D  D  D  D  D   | R/W  | Program RAM (2K)
	2000-203F     |  D  D  D  D  D  D  D  D   | R/W  | Quad-Pokey I/O
	              |                           |      |
	2800          |  D                        |  R   | Fire 1 Switch
	2800          |     D                     |  R   | Shield 1 Switch
	2800          |        D                  |  R   | Fire 2 Switch
	2800          |           D               |  R   | Shield 2 Switch
	2800          |              D            |  R   | Not Used
	2800          |                 D         |  R   | Speech Chip Ready
	2800          |                    D      |  R   | Alpha Rcvd Flag
	2800          |                       D   |  R   | Alpha Xmtd Flag
	              |                           |      |
	3000          |  D  D  D  D  D  D  D  D   |  R   | Alpha Comm. Read Port
	              |                           |      |
	3800-3803     |  D  D  D  D  D  D  D  D   |  R   | Roller Controller Input
	              |                           |      |
	4000          |                           |  W   | IRQ Acknowledge
	4800          |                    D      |  W   | Left Coin Counter
	4800          |                       D   |  W   | Right Coin Counter
	              |                           |      |
	5000          |  D  D  D  D  D  D  D  D   |  W   | Alpha Comm. Write Port
	              |                           |      |
	6000-61FF     |  D  D  D  D  D  D  D  D   | R/W  | EEROM
	8000-BFFF     |  D  D  D  D  D  D  D  D   |  R   | Program ROM (16K)
	-----------------------------------------------------------------------------



	MAJOR HAVOC DIP SWITCH SETTINGS

	$=Default

	DIP Switch at position 13/14S

	                                  1    2    3    4    5    6    7    8
	STARTING LIVES                  _________________________________________
	Free Play   1 Coin   2 Coin     |    |    |    |    |    |    |    |    |
	    2         3         5      $|Off |Off |    |    |    |    |    |    |
	    3         4         4       | On | On |    |    |    |    |    |    |
	    4         5         6       | On |Off |    |    |    |    |    |    |
	    5         6         7       |Off | On |    |    |    |    |    |    |
	GAME DIFFICULTY                 |    |    |    |    |    |    |    |    |
	Hard                            |    |    | On | On |    |    |    |    |
	Medium                         $|    |    |Off |Off |    |    |    |    |
	Easy                            |    |    |Off | On |    |    |    |    |
	Demo                            |    |    | On |Off |    |    |    |    |
	BONUS LIFE                      |    |    |    |    |    |    |    |    |
	50,000                          |    |    |    |    | On | On |    |    |
	100,000                        $|    |    |    |    |Off |Off |    |    |
	200,000                         |    |    |    |    |Off | On |    |    |
	No Bonus Life                   |    |    |    |    | On |Off |    |    |
	ATTRACT MODE SOUND              |    |    |    |    |    |    |    |    |
	Silence                         |    |    |    |    |    |    | On |    |
	Sound                          $|    |    |    |    |    |    |Off |    |
	ADAPTIVE DIFFICULTY             |    |    |    |    |    |    |    |    |
	No                              |    |    |    |    |    |    |    | On |
	Yes                            $|    |    |    |    |    |    |    |Off |
	                                -----------------------------------------

		DIP Switch at position 8S

	                                  1    2    3    4    5    6    7    8
	                                _________________________________________
	Free Play                       |    |    |    |    |    |    | On |Off |
	1 Coin for 1 Game               |    |    |    |    |    |    |Off |Off |
	1 Coin for 2 Games              |    |    |    |    |    |    | On | On |
	2 Coins for 1 Game             $|    |    |    |    |    |    |Off | On |
	RIGHT COIN MECHANISM            |    |    |    |    |    |    |    |    |
	x1                             $|    |    |    |    |Off |Off |    |    |
	x4                              |    |    |    |    |Off | On |    |    |
	x5                              |    |    |    |    | On |Off |    |    |
	x6                              |    |    |    |    | On | On |    |    |
	LEFT COIN MECHANISM             |    |    |    |    |    |    |    |    |
	x1                             $|    |    |    |Off |    |    |    |    |
	x2                              |    |    |    | On |    |    |    |    |
	BONUS COIN ADDER                |    |    |    |    |    |    |    |    |
	No Bonus Coins                 $|Off |Off |Off |    |    |    |    |    |
	Every 4, add 1                  |Off | On |Off |    |    |    |    |    |
	Every 4, add 2                  |Off | On | On |    |    |    |    |    |
	Every 5, add 1                  | On |Off |Off |    |    |    |    |    |
	Every 3, add 1                  | On |Off | On |    |    |    |    |    |
	                                -----------------------------------------

		2 COIN MINIMUM OPTION: Short pin 6 @13N to ground.

***************************************************************************/

#include "driver.h"
#include "vidhrdw/generic.h"
#include "machine/mathbox.h"
#include "machine/atari_vg.h"
#include "vidhrdw/avgdvg.h"
#include "vidhrdw/vector.h"
#include "mhavoc.h"



/*************************************
 *
 *	Alpha One: dual POKEY?
 *
 *************************************/

static READ_HANDLER( dual_pokey_r )
{
	int pokey_num = (offset >> 3) & 0x01;
	int control = (offset & 0x10) >> 1;
	int pokey_reg = (offset % 8) | control;

	if (pokey_num == 0)
		return pokey1_r(pokey_reg);
	else
		return pokey2_r(pokey_reg);
}


static WRITE_HANDLER( dual_pokey_w )
{
	int pokey_num = (offset >> 3) & 0x01;
	int control = (offset & 0x10) >> 1;
	int pokey_reg = (offset % 8) | control;

	if (pokey_num == 0)
		pokey1_w(pokey_reg, data);
	else
		pokey2_w(pokey_reg, data);
}



/*************************************
 *
 *	Gamma RAM
 *
 *************************************/

static data8_t *gammaram;

static READ_HANDLER( mhavoc_gammaram_r )
{
	return gammaram[offset & 0x7ff];
}

static WRITE_HANDLER( mhavoc_gammaram_w )
{
	gammaram[offset & 0x7ff] = data;
}



/*************************************
 *
 *	Alpha CPU memory handlers
 *
 *************************************/

static MEMORY_READ_START( alpha_readmem )
	{ 0x0000, 0x01ff, MRA_RAM },			/* 0.5K Program Ram */
	{ 0x0200, 0x07ff, MRA_BANK1 },			/* 3K Paged Program RAM	*/
	{ 0x0800, 0x09ff, MRA_RAM },			/* 0.5K Program RAM */
	{ 0x1000, 0x1000, mhavoc_gamma_r },		/* Gamma Read Port */
	{ 0x1200, 0x1200, mhavoc_port_0_r },	/* Alpha Input Port 0 */
	{ 0x1800, 0x1fff, MRA_RAM },			/* Shared Beta Ram */
	{ 0x2000, 0x3fff, MRA_BANK2 },			/* Paged Program ROM (32K) */
	{ 0x4000, 0x4fff, MRA_RAM }, 			/* Vector RAM (4K) */
	{ 0x5000, 0x5fff, MRA_ROM },			/* Vector ROM (4K) */
	{ 0x6000, 0x7fff, MRA_BANK3 },			/* Paged Vector ROM (32K) */
	{ 0x8000, 0xffff, MRA_ROM },			/* Program ROM (32K) */
MEMORY_END


static MEMORY_WRITE_START( alpha_writemem )
	{ 0x0000, 0x01ff, MWA_RAM },			/* 0.5K Program Ram */
	{ 0x0200, 0x07ff, MWA_BANK1 },			/* 3K Paged Program RAM */
	{ 0x0800, 0x09ff, MWA_RAM },			/* 0.5K Program RAM */
	{ 0x1200, 0x1200, MWA_NOP },			/* don't care */
	{ 0x1400, 0x141f, mhavoc_colorram_w },	/* ColorRAM */
	{ 0x1600, 0x1600, mhavoc_out_0_w },		/* Control Signals */
	{ 0x1640, 0x1640, avgdvg_go_w },		/* Vector Generator GO */
	{ 0x1680, 0x1680, watchdog_reset_w },	/* Watchdog Clear */
	{ 0x16c0, 0x16c0, avgdvg_reset_w },		/* Vector Generator Reset */
	{ 0x1700, 0x1700, mhavoc_alpha_irq_ack_w },/* IRQ ack */
	{ 0x1740, 0x1740, mhavoc_rom_banksel_w },/* Program ROM Page Select */
	{ 0x1780, 0x1780, mhavoc_ram_banksel_w },/* Program RAM Page Select */
	{ 0x17c0, 0x17c0, mhavoc_gamma_w },		/* Gamma Communication Write Port */
	{ 0x1800, 0x1fff, MWA_RAM },			/* Shared Beta Ram */
	{ 0x2000, 0x3fff, MWA_ROM },			/* Major Havoc writes here.*/
	{ 0x4000, 0x4fff, MWA_RAM, &vectorram, &vectorram_size },/* Vector Generator RAM	*/
	{ 0x6000, 0xffff, MWA_ROM },
MEMORY_END



/*************************************
 *
 *	Gamma CPU memory handlers
 *
 *************************************/

static MEMORY_READ_START( gamma_readmem )
	{ 0x0000, 0x07ff, MRA_RAM },			/* Program RAM (2K)	*/
	{ 0x0800, 0x1fff, mhavoc_gammaram_r },	/* wraps to 0x000-0x7ff */
	{ 0x2000, 0x203f, quad_pokey_r },		/* Quad Pokey read	*/
	{ 0x2800, 0x2800, mhavoc_port_1_r },	/* Gamma Input Port	*/
	{ 0x3000, 0x3000, mhavoc_alpha_r },		/* Alpha Comm. Read Port*/
	{ 0x3800, 0x3803, input_port_2_r },		/* Roller Controller Input*/
	{ 0x4000, 0x4000, input_port_4_r },		/* DSW at 8S */
	{ 0x6000, 0x61ff, MRA_RAM },			/* EEROM		*/
	{ 0x8000, 0xffff, MRA_ROM },			/* Program ROM (16K)	*/
MEMORY_END


static MEMORY_WRITE_START( gamma_writemem )
	{ 0x0000, 0x07ff, MWA_RAM },			/* Program RAM (2K)	*/
	{ 0x0800, 0x1fff, mhavoc_gammaram_w, &gammaram },	/* wraps to 0x000-0x7ff */
	{ 0x2000, 0x203f, quad_pokey_w },		/* Quad Pokey write	*/
	{ 0x4000, 0x4000, mhavoc_gamma_irq_ack_w },	/* IRQ Acknowledge	*/
	{ 0x4800, 0x4800, mhavoc_out_1_w },		/* Coin Counters 	*/
	{ 0x5000, 0x5000, mhavoc_alpha_w },		/* Alpha Comm. Write Port */
	{ 0x6000, 0x61ff, MWA_RAM, &generic_nvram, &generic_nvram_size },	/* EEROM		*/
MEMORY_END



/*************************************
 *
 *	Main CPU memory handlers (Alpha One)
 *
 *************************************/

static MEMORY_READ_START( alphaone_readmem )
	{ 0x0000, 0x01ff, MRA_RAM },			/* 0.5K Program Ram */
	{ 0x0200, 0x07ff, MRA_BANK1 },			/* 3K Paged Program RAM	*/
	{ 0x0800, 0x09ff, MRA_RAM },			/* 0.5K Program RAM */
	{ 0x1020, 0x103f, dual_pokey_r },
	{ 0x1040, 0x1040, alphaone_port_0_r },	/* Alpha Input Port 0 */
	{ 0x1060, 0x1060, input_port_1_r },		/* Gamma Input Port	*/
	{ 0x1080, 0x1080, input_port_2_r },		/* Roller Controller Input*/
	{ 0x1800, 0x18ff, MRA_RAM },			/* EEROM		*/
	{ 0x2000, 0x3fff, MRA_BANK2 },			/* Paged Program ROM (32K) */
	{ 0x4000, 0x4fff, MRA_RAM }, 			/* Vector RAM (4K) */
	{ 0x5000, 0x5fff, MRA_ROM },			/* Vector ROM (4K) */
	{ 0x6000, 0x7fff, MRA_BANK3 },			/* Paged Vector ROM (32K) */
	{ 0x8000, 0xffff, MRA_ROM },			/* Program ROM (32K) */
MEMORY_END


static MEMORY_WRITE_START( alphaone_writemem )
	{ 0x0000, 0x01ff, MWA_RAM },			/* 0.5K Program Ram */
	{ 0x0200, 0x07ff, MWA_BANK1 },			/* 3K Paged Program RAM */
	{ 0x0800, 0x09ff, MWA_RAM },			/* 0.5K Program RAM */
	{ 0x1020, 0x103f, dual_pokey_w },
	{ 0x1040, 0x1040, MWA_NOP },			/* Nothing here */
	{ 0x10a0, 0x10a0, alphaone_out_0_w },	/* Control Signals */
	{ 0x10a4, 0x10a4, avgdvg_go_w },		/* Vector Generator GO */
	{ 0x10a8, 0x10a8, watchdog_reset_w },	/* Watchdog Clear */
	{ 0x10ac, 0x10ac, avgdvg_reset_w },		/* Vector Generator Reset */
	{ 0x10b0, 0x10b0, mhavoc_alpha_irq_ack_w },	/* IRQ ack */
	{ 0x10b4, 0x10b4, mhavoc_rom_banksel_w },
	{ 0x10b8, 0x10b8, mhavoc_ram_banksel_w },
	{ 0x10e0, 0x10ff, mhavoc_colorram_w },	/* ColorRAM */
	{ 0x1800, 0x18ff, MWA_RAM, &generic_nvram, &generic_nvram_size },	/* EEROM		*/
	{ 0x2000, 0x3fff, MWA_ROM },			/* Major Havoc writes here.*/
	{ 0x4000, 0x4fff, MWA_RAM, &vectorram, &vectorram_size },/* Vector Generator RAM	*/
	{ 0x6000, 0xffff, MWA_ROM },
MEMORY_END



/*************************************
 *
 *	Port definitions
 *
 *************************************/

INPUT_PORTS_START( mhavoc )
	PORT_START	/* IN0 - alpha (player_1 = 0) */
	PORT_BIT ( 0x03, IP_ACTIVE_HIGH, IPT_SPECIAL )
	PORT_BIT ( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT )
	PORT_BIT ( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT )
	PORT_BIT ( 0x10, IP_ACTIVE_LOW, IPT_JOYSTICK_UP )
	PORT_BITX( 0x20, IP_ACTIVE_LOW, IPT_SERVICE, "Diag Step/Coin C", KEYCODE_F1, IP_JOY_NONE )
	PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_COIN1 )	/* Left Coin Switch  */
	PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_COIN2 )	/* Right Coin */

	PORT_START	/* IN1 - gamma */
	PORT_BIT ( 0x0f, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT ( 0x10, IP_ACTIVE_LOW, IPT_BUTTON2 | IPF_PLAYER2 )
	PORT_BIT ( 0x20, IP_ACTIVE_LOW, IPT_BUTTON1 | IPF_PLAYER2 )
	PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_BUTTON2 )
	PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_BUTTON1 )

	PORT_START	/* IN2 - gamma */
	PORT_ANALOG( 0xff, 0x00, IPT_DIAL | IPF_REVERSE, 100, 40, 0, 0 )

	PORT_START /* DIP Switch at position 13/14S */
	PORT_DIPNAME( 0x01, 0x00, "Adaptive Difficulty" )
	PORT_DIPSETTING(    0x01, DEF_STR( Off ))
	PORT_DIPSETTING(    0x00, DEF_STR( On ))
	PORT_DIPNAME( 0x02, 0x00, DEF_STR( Demo_Sounds ) )
	PORT_DIPSETTING(    0x02, DEF_STR( Off ))
	PORT_DIPSETTING(    0x00, DEF_STR( On ))
	PORT_DIPNAME( 0x0c, 0x00, DEF_STR( Bonus_Life ) )
	PORT_DIPSETTING(    0x0c, "50000")
	PORT_DIPSETTING(    0x00, "100000")
	PORT_DIPSETTING(    0x04, "200000")
	PORT_DIPSETTING(    0x08, "None")
	PORT_DIPNAME( 0x30, 0x00, DEF_STR( Difficulty ) )
	PORT_DIPSETTING(    0x10, "Easy")
	PORT_DIPSETTING(    0x00, "Medium")
	PORT_DIPSETTING(    0x30, "Hard")
	PORT_DIPSETTING(    0x20, "Demo")
	PORT_DIPNAME( 0xc0, 0x00, DEF_STR( Lives ) )
	PORT_DIPSETTING(    0x00, "3 (2 in Free Play)")
	PORT_DIPSETTING(    0xc0, "4 (3 in Free Play)")
	PORT_DIPSETTING(    0x80, "5 (4 in Free Play)")
	PORT_DIPSETTING(    0x40, "6 (5 in Free Play)")

	PORT_START /* DIP Switch at position 8S */
	PORT_DIPNAME( 0x03, 0x03, DEF_STR( Coinage ) )
	PORT_DIPSETTING(    0x02, DEF_STR( 2C_1C ) )
	PORT_DIPSETTING(    0x03, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING(    0x00, DEF_STR( 1C_2C ) )
	PORT_DIPSETTING(    0x01, DEF_STR( Free_Play ) )
	PORT_DIPNAME( 0x0c, 0x0c, "Right Coin Mechanism" )
	PORT_DIPSETTING(    0x0c, "x1" )
	PORT_DIPSETTING(    0x08, "x4" )
	PORT_DIPSETTING(    0x04, "x5" )
	PORT_DIPSETTING(    0x00, "x6" )
	PORT_DIPNAME( 0x10, 0x10, "Left Coin Mechanism" )
	PORT_DIPSETTING(    0x10, "x1" )
	PORT_DIPSETTING(    0x00, "x2" )
	PORT_DIPNAME( 0xe0, 0xe0, "Bonus Credits" )
	PORT_DIPSETTING(    0x80, "2 each 4" )
	PORT_DIPSETTING(    0x40, "1 each 3" )
	PORT_DIPSETTING(    0xa0, "1 each 4" )
	PORT_DIPSETTING(    0x60, "1 each 5" )
	PORT_DIPSETTING(    0xe0, "None" )

	PORT_START	/* IN5 - dummy for player_1 = 1 on alpha */
	PORT_BIT ( 0x3f, IP_ACTIVE_HIGH, IPT_SPECIAL )
	PORT_DIPNAME( 0x40, 0x40, "Credit to start" )
	PORT_DIPSETTING(    0x40, "1" )
	PORT_DIPSETTING(    0x00, "2" )
	PORT_SERVICE( 0x80, IP_ACTIVE_LOW )
INPUT_PORTS_END


INPUT_PORTS_START( mhavocp )
	PORT_START	/* IN0 - alpha (player_1 = 0) */
	PORT_BIT ( 0x0f, IP_ACTIVE_HIGH, IPT_SPECIAL )
	PORT_BIT ( 0x10, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BITX( 0x20, IP_ACTIVE_LOW, IPT_SERVICE, "Diag Step/Coin C", KEYCODE_F1, IP_JOY_NONE )
	PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_COIN1 )	/* Left Coin Switch  */
	PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_COIN2 )	/* Right Coin */

	PORT_START	/* IN1 - gamma */
	PORT_BIT ( 0x0f, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT ( 0x10, IP_ACTIVE_LOW, IPT_BUTTON2 | IPF_PLAYER2 )
	PORT_BIT ( 0x20, IP_ACTIVE_LOW, IPT_BUTTON1 | IPF_PLAYER2 )
	PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_BUTTON2 )
	PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_BUTTON1 )

	PORT_START	/* IN2 - gamma */
	PORT_ANALOG( 0xff, 0x00, IPT_DIAL | IPF_REVERSE, 100, 40, 0, 0 )

	PORT_START /* DIP Switch at position 13/14S */
	PORT_DIPNAME( 0x03, 0x00, DEF_STR( Lives ) )
	PORT_DIPSETTING(    0x00, "1" )
	PORT_DIPSETTING(    0x01, "2" )
	PORT_DIPSETTING(    0x02, "3" )
	PORT_DIPSETTING(    0x03, "4" )
	PORT_DIPNAME( 0x0c, 0x00, DEF_STR( Bonus_Life ) )
	PORT_DIPSETTING(    0x0c, "50000")
	PORT_DIPSETTING(    0x00, "100000")
	PORT_DIPSETTING(    0x04, "200000")
	PORT_DIPSETTING(    0x08, "None")
	PORT_DIPNAME( 0x30, 0x00, DEF_STR( Difficulty ) )
	PORT_DIPSETTING(    0x10, "Easy")
	PORT_DIPSETTING(    0x00, "Medium")
	PORT_DIPSETTING(    0x30, "Hard")
	PORT_DIPSETTING(    0x20, "Demo")
	PORT_DIPNAME( 0xc0, 0x00, DEF_STR( Lives ) )
	PORT_DIPSETTING(    0x00, "3 (2 in Free Play)")
	PORT_DIPSETTING(    0xc0, "4 (3 in Free Play)")
	PORT_DIPSETTING(    0x80, "5 (4 in Free Play)")
	PORT_DIPSETTING(    0x40, "6 (5 in Free Play)")

	PORT_START /* DIP Switch at position 8S */
	PORT_DIPNAME( 0x03, 0x03, DEF_STR( Coinage ) )
	PORT_DIPSETTING(    0x02, DEF_STR( 2C_1C ) )
	PORT_DIPSETTING(    0x03, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING(    0x00, DEF_STR( 1C_2C ) )
	PORT_DIPSETTING(    0x01, DEF_STR( Free_Play ) )
	PORT_DIPNAME( 0x0c, 0x0c, "Right Coin Mechanism" )
	PORT_DIPSETTING(    0x0c, "x1" )
	PORT_DIPSETTING(    0x08, "x4" )
	PORT_DIPSETTING(    0x04, "x5" )
	PORT_DIPSETTING(    0x00, "x6" )
	PORT_DIPNAME( 0x10, 0x10, "Left Coin Mechanism" )
	PORT_DIPSETTING(    0x10, "x1" )
	PORT_DIPSETTING(    0x00, "x2" )
	PORT_DIPNAME( 0xe0, 0xe0, "Bonus Credits" )
	PORT_DIPSETTING(    0x80, "2 each 4" )
	PORT_DIPSETTING(    0x40, "1 each 3" )
	PORT_DIPSETTING(    0xa0, "1 each 4" )
	PORT_DIPSETTING(    0x60, "1 each 5" )
	PORT_DIPSETTING(    0xe0, "None" )

	PORT_START	/* IN5 - dummy for player_1 = 1 on alpha */
	PORT_BIT ( 0x3f, IP_ACTIVE_HIGH, IPT_SPECIAL )
	PORT_DIPNAME( 0x40, 0x40, "Credit to start" )
	PORT_DIPSETTING(    0x40, "1" )
	PORT_DIPSETTING(    0x00, "2" )
	PORT_SERVICE( 0x80, IP_ACTIVE_LOW )
INPUT_PORTS_END


INPUT_PORTS_START( alphaone )
	PORT_START	/* IN0 - alpha (player_1 = 0) */
	PORT_BIT ( 0x03, IP_ACTIVE_HIGH, IPT_SPECIAL )
	PORT_BIT ( 0x7c, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_BUTTON1 )

	PORT_START	/* IN1 - gamma */
	PORT_BIT ( 0x0f, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_SERVICE( 0x10, IP_ACTIVE_LOW )
	PORT_BIT ( 0x20, IP_ACTIVE_LOW, IPT_COIN3 )
	PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_COIN2 )
	PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_COIN1 )

	PORT_START	/* IN2 - gamma */
	PORT_ANALOG( 0xff, 0x00, IPT_DIAL | IPF_REVERSE, 100, 40, 0, 0 )
INPUT_PORTS_END



/*************************************
 *
 *	Sound interfaces
 *
 *************************************/

static struct POKEYinterface pokey_interface =
{
	4,	/* 4 chips */
	MHAVOC_CLOCK_1_25M,	/* 1.25 MHz??? */
	{ 25, 25, 25, 25 },
	/* The 8 pot handlers */
	{ 0, 0, 0, 0 },
	{ 0, 0, 0, 0 },
	{ 0, 0, 0, 0 },
	{ 0, 0, 0, 0 },
	{ 0, 0, 0, 0 },
	{ 0, 0, 0, 0 },
	{ 0, 0, 0, 0 },
	{ 0, 0, 0, 0 },
	/* The allpot handler */
	{ input_port_3_r, 0, 0, 0 },
};


static struct POKEYinterface pokey_interface_alphaone =
{
	2,	/* 2 chips */
	MHAVOC_CLOCK_1_25M,	/* 1.25 MHz??? */
	{ 50, 50 },
	/* The 8 pot handlers */
	{ 0, 0 },
	{ 0, 0 },
	{ 0, 0 },
	{ 0, 0 },
	{ 0, 0 },
	{ 0, 0 },
	{ 0, 0 },
	{ 0, 0 },
	/* The allpot handler */
	{ 0, 0 },
};



/*************************************
 *
 *	Machine drivers
 *
 *************************************/

static MACHINE_DRIVER_START( mhavoc )

	/* basic machine hardware */
	MDRV_CPU_ADD_TAG("alpha", M6502, MHAVOC_CLOCK_2_5M)		/* 2.5 MHz */
	MDRV_CPU_MEMORY(alpha_readmem,alpha_writemem)

	MDRV_CPU_ADD_TAG("gamma", M6502, MHAVOC_CLOCK_1_25M)	/* 1.25 MHz */
	MDRV_CPU_MEMORY(gamma_readmem,gamma_writemem)

	MDRV_FRAMES_PER_SECOND(50)
	MDRV_MACHINE_INIT(mhavoc)
	MDRV_NVRAM_HANDLER(generic_1fill)

	/* video hardware */
	MDRV_VIDEO_ATTRIBUTES(VIDEO_TYPE_VECTOR | VIDEO_RGB_DIRECT)
	MDRV_SCREEN_SIZE(400, 300)
	MDRV_VISIBLE_AREA(0, 300, 0, 260)
	MDRV_PALETTE_LENGTH(32768)

	MDRV_PALETTE_INIT(avg_multi)
	MDRV_VIDEO_START(avg_mhavoc)
	MDRV_VIDEO_UPDATE(vector)

	/* sound hardware */
	MDRV_SOUND_ADD_TAG("pokey", POKEY, pokey_interface)
MACHINE_DRIVER_END


static MACHINE_DRIVER_START( alphaone )

	/* basic machine hardware */
	MDRV_IMPORT_FROM(mhavoc)
	MDRV_CPU_MODIFY("alpha")
	MDRV_CPU_MEMORY(alphaone_readmem,alphaone_writemem)
	MDRV_CPU_REMOVE("gamma")

	/* video hardware */
	MDRV_VISIBLE_AREA(0, 580, 0, 500)
	MDRV_VIDEO_START(avg_alphaone)

	/* sound hardware */
	MDRV_SOUND_REPLACE("pokey", POKEY, pokey_interface_alphaone)
MACHINE_DRIVER_END



/*************************************
 *
 *	ROM definitions
 *
 *************************************/

/*
 * Notes:
 * the R3 roms are supported as "mhavoc", the R2 roms (with a bug in gameplay)
 * are supported as "mhavoc2".
 * "Return to Vax" - Jess Askey's souped up version (errors on self test)
 * are supported as "mhavocrv".
 * Prototype is supported as "mhavocp"
 * Alpha one is a single-board prototype
 */

ROM_START( mhavoc )
	/* Alpha Processor ROMs */
	ROM_REGION( 0x21000, REGION_CPU1, 0 )	/* 152KB for ROMs */
	/* Vector Generator ROM */
	ROM_LOAD( "136025.210",   0x05000, 0x2000, CRC(c67284ca) SHA1(d9adad80c266d36429444f483cac4ebcf1fec7b8) )

	/* Program ROM */
	ROM_LOAD( "136025.216",   0x08000, 0x4000, CRC(522a9cc0) SHA1(bbd75e01c45220e1c87bd1e013cf2c2fb9f376b2) )
	ROM_LOAD( "136025.217",   0x0c000, 0x4000, CRC(ea3d6877) SHA1(27823c1b546c073b37ff11a8cb25312ea71673c2) )

	/* Paged Program ROM */
	ROM_LOAD( "136025.215",   0x10000, 0x4000, CRC(a4d380ca) SHA1(c3cdc76054be2f904b1fb6f28c3c027eba5c3a70) ) /* page 0+1 */
	ROM_LOAD( "136025.318",   0x14000, 0x4000, CRC(ba935067) SHA1(05ad81e7a1982b9d8fddb48502546f48b5dc21b7) ) /* page 2+3 */

	/* Paged Vector Generator ROM */
	ROM_LOAD( "136025.106",   0x18000, 0x4000, CRC(2ca83c76) SHA1(cc1adca32f70af30c4590e9fd6b056b051ccdb38) ) /* page 0+1 */
	ROM_LOAD( "136025.107",   0x1c000, 0x4000, CRC(5f81c5f3) SHA1(be4055727a2d4536e37ec20150deffdb5af5b01f) ) /* page 2+3 */

	/* Gamma Processor ROM */
	ROM_REGION( 0x10000, REGION_CPU2, 0 ) /* 16k for code */
	ROM_LOAD( "136025.108",   0x08000, 0x4000, CRC(93faf210) SHA1(7744368a1d520f986d1c4246113a7e24fcdd6d04) )
	ROM_RELOAD(               0x0c000, 0x4000 ) /* reset+interrupt vectors */
ROM_END


ROM_START( mhavoc2 )
	/* Alpha Processor ROMs */
	ROM_REGION( 0x21000, REGION_CPU1, 0 )
	/* Vector Generator ROM */
	ROM_LOAD( "136025.110",   0x05000, 0x2000, CRC(16eef583) SHA1(277252bd716dd96d5b98ec5e33a3a6a3bc1a9abf) )

	/* Program ROM */
	ROM_LOAD( "136025.103",   0x08000, 0x4000, CRC(bf192284) SHA1(4c2dc3ba75122e521ebf2c42f89b31737613c2df) )
	ROM_LOAD( "136025.104",   0x0c000, 0x4000, CRC(833c5d4e) SHA1(932861b2a329172247c1a5d0a6498a00a1fce814) )

	/* Paged Program ROM - switched to 2000-3fff */
	ROM_LOAD( "136025.101",   0x10000, 0x4000, CRC(2b3b591f) SHA1(39fd6fdd14367906bc0102bde15d509d3289206b) ) /* page 0+1 */
	ROM_LOAD( "136025.109",   0x14000, 0x4000, CRC(4d766827) SHA1(7697bf6f92bff0e62850ed75ff66008a08583ef7) ) /* page 2+3 */

	/* Paged Vector Generator ROM */
	ROM_LOAD( "136025.106",   0x18000, 0x4000, CRC(2ca83c76) SHA1(cc1adca32f70af30c4590e9fd6b056b051ccdb38) ) /* page 0+1 */
	ROM_LOAD( "136025.107",   0x1c000, 0x4000, CRC(5f81c5f3) SHA1(be4055727a2d4536e37ec20150deffdb5af5b01f) ) /* page 2+3 */

	/* the last 0x1000 is used for the 2 RAM pages */

	/* Gamma Processor ROM */
	ROM_REGION( 0x10000, REGION_CPU2, 0 )	/* 16k for code */
	ROM_LOAD( "136025.108",   0x08000, 0x4000, CRC(93faf210) SHA1(7744368a1d520f986d1c4246113a7e24fcdd6d04) )
	ROM_RELOAD(               0x0c000, 0x4000 ) /* reset+interrupt vectors */
ROM_END


ROM_START( mhavocrv )
	/* Alpha Processor ROMs */
	ROM_REGION( 0x21000, REGION_CPU1, 0 )	/* 152KB for ROMs */
	/* Vector Generator ROM */
	ROM_LOAD( "136025.210",   0x05000, 0x2000, CRC(c67284ca) SHA1(d9adad80c266d36429444f483cac4ebcf1fec7b8) )

	/* Program ROM */
	ROM_LOAD( "136025.916",   0x08000, 0x4000, CRC(1255bd7f) SHA1(e277fe7b23ce8cf1294b6bfa5548b24a6c8952ce) )
	ROM_LOAD( "136025.917",   0x0c000, 0x4000, CRC(21889079) SHA1(d1ad6d9fa1432912e376bca50ceeefac2bfd6ac3) )

	/* Paged Program ROM */
	ROM_LOAD( "136025.915",   0x10000, 0x4000, CRC(4c7235dc) SHA1(67cafc2ce438ec389550efb46c554a7fe7b45efc) ) /* page 0+1 */
	ROM_LOAD( "136025.918",   0x14000, 0x4000, CRC(84735445) SHA1(21aacd862ce8911d257c6f48ead119ee5bb0b60d) ) /* page 2+3 */

	/* Paged Vector Generator ROM */
	ROM_LOAD( "136025.106",   0x18000, 0x4000, CRC(2ca83c76) SHA1(cc1adca32f70af30c4590e9fd6b056b051ccdb38) ) /* page 0+1 */
	ROM_LOAD( "136025.907",   0x1c000, 0x4000, CRC(4deea2c9) SHA1(c4107581748a3f2d2084de2a4f120abd67a52189) ) /* page 2+3 */

	/* Gamma Processor ROM */
	ROM_REGION( 0x10000, REGION_CPU2, 0 ) /* 16k for code */
	ROM_LOAD( "136025.908",   0x08000, 0x4000, CRC(c52ec664) SHA1(08120a385f71b17ec02a3c2ef856ff835a91773e) )
	ROM_RELOAD(               0x0c000, 0x4000 ) /* reset+interrupt vectors */
ROM_END


ROM_START( mhavocp )
	/* Alpha Processor ROMs */
	ROM_REGION( 0x21000, REGION_CPU1, 0 )
	/* Vector Generator ROM */
	ROM_LOAD( "136025.010",   0x05000, 0x2000, CRC(3050c0e6) SHA1(f19a9538996d949cdca7e6abd4f04e8ff6e0e2c1) )

	/* Program ROM */
	ROM_LOAD( "136025.016",   0x08000, 0x4000, CRC(94caf6c0) SHA1(8734411280bd0484c99a59231b97ad64d6e787e8) )
	ROM_LOAD( "136025.017",   0x0c000, 0x4000, CRC(05cba70a) SHA1(c069e6dec3e5bc278103156d0908ab93f3784be1) )

	/* Paged Program ROM - switched to 2000-3fff */
	ROM_LOAD( "136025.015",   0x10000, 0x4000, CRC(c567c11b) SHA1(23b89389f59bb6a040342adfe583818a91ce5bff) )
	ROM_LOAD( "136025.018",   0x14000, 0x4000, CRC(a8c35ccd) SHA1(c243a5407557390a64c6560d857f5031f839973f) )

	/* Paged Vector Generator ROM */
	ROM_LOAD( "136025.006",   0x18000, 0x4000, CRC(e272ed41) SHA1(0de395d1c4300a64da7f45746d7b550779e36a21) )
	ROM_LOAD( "136025.007",   0x1c000, 0x4000, CRC(e152c9d8) SHA1(79d0938fa9ad262c7f28c5a8ad21004a4dec9ed8) )

	/* the last 0x1000 is used for the 2 RAM pages */

	/* Gamma Processor ROM */
	ROM_REGION( 0x10000, REGION_CPU2, 0 ) /* 16k for code */
	ROM_LOAD( "136025.008",   0x8000, 0x4000, CRC(22ea7399) SHA1(eeda8cc40089506063835a62c3273e7dd3918fd5) )
	ROM_RELOAD(               0xc000, 0x4000 )/* reset+interrupt vectors */
ROM_END


ROM_START( alphaone )
	ROM_REGION( 0x21000, REGION_CPU1, 0 )
	/* Vector Generator ROM */
	ROM_LOAD( "vec5000.tw",   0x05000, 0x1000, CRC(2a4c149f) SHA1(b60a0b29958bee9b5f7c1d88163680b626bb76dd) )

	/* Program ROM */
	ROM_LOAD( "8000.tw",      0x08000, 0x2000, CRC(962d4da2) SHA1(2299f850aed7470a80a21526143f7b412a879cb1) )
	ROM_LOAD( "a000.tw",      0x0a000, 0x2000, CRC(f739a791) SHA1(1e70e446fc7dd27683ad71e768ebb2bc1d4fedd3) )
	ROM_LOAD( "twjk1.bin",    0x0c000, 0x2000, CRC(1ead0b34) SHA1(085e05526d029bcff7c8ae050cde73f52ee13846) )
	ROM_LOAD( "e000.tw",      0x0e000, 0x1000, CRC(6b1d7d2b) SHA1(36ac8b53e2fe01ed281c94afec02484ef676ddad) )
	ROM_RELOAD(               0x0f000, 0x1000 )

	/* Paged Program ROM - switched to 2000-3fff */
	ROM_LOAD( "page01.tw",    0x10000, 0x4000, CRC(cbf3b05a) SHA1(1dfaf9300a252c9c921f06167160a59cdf329726) )

	/* Paged Vector Generator ROM */
	ROM_LOAD( "vec_pg01.tw",  0x18000, 0x4000, CRC(e392a94d) SHA1(b5843da97d7aa5767c87c29660115efc5ad9ad54) )
	ROM_LOAD( "vec_pg23.tw",  0x1c000, 0x4000, CRC(1ff74292) SHA1(90e61c48544c62d905e207bba5c67ae7694e86a5) )

	/* the last 0x1000 is used for the 2 RAM pages */
ROM_END


ROM_START( alphaona )
	ROM_REGION( 0x21000, REGION_CPU1, 0 )
	/* Vector Generator ROM */
	ROM_LOAD( "vec5000.tw",   0x05000, 0x1000, CRC(2a4c149f) SHA1(b60a0b29958bee9b5f7c1d88163680b626bb76dd) )

	/* Program ROM */
	ROM_LOAD( "8000.tw",      0x08000, 0x2000, CRC(962d4da2) SHA1(2299f850aed7470a80a21526143f7b412a879cb1) )
	ROM_LOAD( "a000.tw",      0x0a000, 0x2000, CRC(f739a791) SHA1(1e70e446fc7dd27683ad71e768ebb2bc1d4fedd3) )
	ROM_LOAD( "c000.tw",      0x0c000, 0x2000, CRC(f21fb1ac) SHA1(2590147e75611a3f87397e7b0baa7020e7528ac8) )
	ROM_LOAD( "e000.tw",      0x0e000, 0x1000, CRC(6b1d7d2b) SHA1(36ac8b53e2fe01ed281c94afec02484ef676ddad) )
	ROM_RELOAD(               0x0f000, 0x1000 )

	/* Paged Program ROM - switched to 2000-3fff */
	ROM_LOAD( "page01.tw",    0x10000, 0x4000, CRC(cbf3b05a) SHA1(1dfaf9300a252c9c921f06167160a59cdf329726) )

	/* Paged Vector Generator ROM */
	ROM_LOAD( "vec_pg01.tw",  0x18000, 0x4000, CRC(e392a94d) SHA1(b5843da97d7aa5767c87c29660115efc5ad9ad54) )
	ROM_LOAD( "vec_pg23.tw",  0x1c000, 0x4000, CRC(1ff74292) SHA1(90e61c48544c62d905e207bba5c67ae7694e86a5) )

	/* the last 0x1000 is used for the 2 RAM pages */
ROM_END



/*************************************
 *
 *	Game drivers
 *
 *************************************/

GAME( 1983, mhavoc,   0,      mhavoc,   mhavoc,   0, ROT0, "Atari", "Major Havoc (rev 3)" )
GAME( 1983, mhavoc2,  mhavoc, mhavoc,   mhavoc,   0, ROT0, "Atari", "Major Havoc (rev 2)" )
GAME( 1983, mhavocrv, mhavoc, mhavoc,   mhavoc,   0, ROT0, "hack",  "Major Havoc (Return to Vax)" )
GAME( 1983, mhavocp,  mhavoc, mhavoc,   mhavocp,  0, ROT0, "Atari", "Major Havoc (prototype)" )
GAME( 1983, alphaone, mhavoc, alphaone, alphaone, 0, ROT0, "Atari", "Alpha One (prototype, 3 lives)" )
GAME( 1983, alphaona, mhavoc, alphaone, alphaone, 0, ROT0, "Atari", "Alpha One (prototype, 5 lives)" )
